The qualified dentist designation (QDD) came about in response to the 2015 practice guidelines paper recommending that physicians refer patients to dentists "qualified" to treat sleep related breathing disorders. This was based upon recognition of which of the following?
1) Older dentists have more experience than younger dentists
2) All dentists have the skills they need to deliver knowledgeable care
3) Oral appliance efficacy data collected in studies is obtained by dentists with extensive clinical experience
4) Training in dental schools on oral appliance therapy has become commonplace